You might be interested in The Benefits of Helix Mooring Systems
I am installing one in conjunction with an existing 1200 pound slab of concrete that has a 1 inch eyebolt inbeded in it. My boat is about the same displacment as yours and I opted for the round shaft anchor http://www.helixmooringsystems.com/b...tml#roundshaft
as it is a more do it yourself project....with scuba of course.
My mooring ball required by the Army Corp of Engineers is a white 24" ball with the blue strip that made it a legal mooring field with their permit issued. Everyone else is only a clingon. Ha!